Composition for constructing molds, cores, and the like for use in casting.



. N Drawing.

- To-aZZ whom it may concern:

UNITED STATES PATENT ori ice;

JoH WILLIAM BAINBRIDGE, or LoNDoN, ENGLAND.

COMPOSITION FOR CONSTRUCTING MOLDS, CORES, AND LIKE FOB TISE IN CASTING.

Application filed July Be-it knownthat I, JoiIN WILLIAM BAIN- BRIDGE, merchant, a sub ect of-the King of xre'at Britain, residingat 2 Fen Court,

Fenchureh street, London, England, have invented a certain'new and useful Improved Composition for Constructing Molds, Cores, and the Like for Use in Casting, and of which the following is a specification.

This invention relates to an improved composition for constructing molds, cores done.

vhas saturated the sand, the

and the like for use in casting. and consists in incorporating -wit-h a mixture of new, and used or burnt sand, a thin paste or thick cream comprising linseed or like vmeal, molasse's and water, to which is added camphor.

'I" have fou'nd'that the employment in the manufacture of molds'of camphor with the other ingredients as stated, enables the metal toliebetterand reduces the proportion of blow holes and faulty castings. Suitable proportions of the ingredients consist of linseed meal equal to from 9 to 5% of the weight of the sand to be treated, molasses of t to 1}% of the weight of the sand to be treated, and a small quantity of camphor, say about 1 to 3% of the weight of the sand, said ingredient-s being made into a thin paste or thick cream by the addition of cold or preferably warm waterjthereto. In cases where the sand treated is required for core making, the proportion of molasses would be increased from say 5% to 50% for the same weight of the sand treated, according to. the class of work to be At the same time by this invention the proportion of new sand employed may be greatly reducedfthat is to say, to the extent of 50% to 80% or even 90%. In employing the composition of linseed meal, molasses and camphor stated, the said thick cream or thin paste mixture is left for sometime in the vats in which it is mined, and therein subjected to frequent stirrings, over the sand-which is spread-in a suitable layer on the floor-such sand having previously been mixed in the usual manner and moistened with water. After the paste mixture is shoveled up and treated in the usual manner.

The molding sand can also be prepared in the following manner:

of linseed meal, molasses and 'camphoris then added, and the whole,

I Specification of Letters Patent.

said prepared sand mixed as previously I after which it is poured,

The molding sand' is mixed in the usual way, the, composition incorporated,

i Patented Jan. 7,1913. Serial No. 708,742. i

after which the mass is moistened"with water and treated in the usual way.

It is sometimes an advantage to mix coaldust with the sand before adding the thick cream-like composition before mentioned, if the molding sand is intended to be used for a so-called wet casting.

here space is available, it is advisable to prepare the sand in large quantities and permit it to lie for somedays, and when using, toremove the oldest sand or that firstly prepared from the bottom, while fresh lots of sand treated with the composit ion are added at the top.

, .By molding sand prepared as abovedescribedtores can be made to any degree of hardness, and if desired the admixture can be so appliedthat the cores after being used in the casting-readily leave. the metal, a great advantage in cases of intricate castings, as with cores as generally constructed much time is frequently occupied in remov-' ing the'cores.

By this invention, the molding sand prepared in accordance therewith is rendered plastic and most easily worked, while the can be readily used for repair work to both molds and cores. At the same time neither the molds nor cores are liable to disintegrate or crack at the surface as no particles ofsand become detached. During the process of casting no unpleasant odors are given off, and as the mold and cores are porous the gases generated in casting freely pass off, without aifecting the surfaces of the casting, which latter is made with a beautiful smooth skin, free from unevenness or other The cores are exceedingly friable after casting, which admits of their being quite easily removed, while the castings are much more easily cleaned than when sand is used in the usual manner.

The admixture of the'composition of linseed meal and other ingredients as stated, with molding and. core sand is of the greatest importance, as not only can the very poorest sand be utilized, but sand of an description can be as successfully used,as the most suitable molding sand and thecompletely burnt sand can be used over and over again, by the addition of only a very small proportion'of new sand. The invention therefore effects a very great-saving in foundries, particularly in such as have to obtain their supplies of sand from a disdefects.

tance, as not only is the actual cost of sand use in casting;

greatly reduced, but there is thereafter no necessity to cart away or remove the old spent sand. The quantity of new sand nec- 5 cssary is only the small proportion required to make good unavoidable waste, and that. necessary in regenerating the used molding sand, and "for this the poorest sand can be used, as when mixed with linseed meal and the othe' ingredients, as stated, it can be worked quite as well as the bestand most cohesive sand previmisly used.

Although throughout this specification the emplo' inent of linseed meal only has been lHtlltlOllQd, it will be obvious that other oily vegetable meal, such for instance as rape meal may be employed instead of, or together with, the linseed meal, the same result: being thereby obtained.

\"Vhat l c .liltl-KIS my invention and desire to secure by Letters Patent is:-

1. The herein (.lcscribed composition for constructing molds, cores and the like, for use in casting; comprising sand incorporated with a thin paste consisting of linseed meal, molasses, camphor and water.

2. The herein described composition for constructing molds, cores and the like, for

comprising moistened sand incorporated with a mixture of linseed meal of about to 5% of the Weight of sand, molasses of about to 1% of the Weight of sand and camphor, made into a thin paste by the addition of water.

3. The herein described composition for constructing molds, cores and the like, for use in casting; comprising moistened sand incorporated with a mixture of linseed meal of about to 5% of the Weight of sand, molasses of about to 1% of the Weight of sand and camphor, of about 1 to 3% of the weight of sand, made into a thin paste by the addition of water.

t. The herein described composition for constructing molds, cores and the like for use in casting; comprising molding sand a proportion of about 50% to 90% of Which has been already used, incorporated With a thin paste consisting of linseed meal, molasses camphor and Water.

Inwitness whereof I have hereunto set in hand in the presence oftwo Witnesses. JOHN \VILLIAlVl BAINBRIDGE. Witnesses:

LOUISE M. TRUMP, 'WILLIAM. A. MARSHALL. 

